A broken underground drain doesn’t always mean digging.
When the pipe is not too distorted or smashed the drain can be lined. This basically is a long fibreglass open ended sock which is impregnated with resin, this “sock” is then fed along the inside of the pipe and a long inflatable (sausage) balloon is inserted to expand the sock and so when the resin has hardened a new plastic pipe runs along the inside of the broken drain.